Last month, a teenage girl died of a suspected drug overdose following an outdoor rave at the Los Angeles Memorial Coliseum, which was hosted by the same promoter.

In the weeks leading up to the event, the San Bernardino Police Department held meetings with the promoter to figure out ways to make it more safe. The promoter agreed to set a minimum age requirement of 18 and had security guards check identification at the gate.

The promoter also agreed to reimburse the city for use of San Bernardino Police officers.